/// <summary>
/// Returns the height and width of the chroma components
/// </summary>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <param name="ratio">The subsampling ratio.</param>
/// <returns>The <see cref="Size"/> of the chrominance channel</returns>
internal static Size CalculateChrominanceSize(
int width,
int height,
YCbCrSubsampleRatio ratio)
{
switch (ratio)
{
case YCbCrSubsampleRatio.YCbCrSubsampleRatio422:
return(new Size((width + 1) / 2, height));
case YCbCrSubsampleRatio.YCbCrSubsampleRatio420:
return(new Size((width + 1) / 2, (height + 1) / 2));
case YCbCrSubsampleRatio.YCbCrSubsampleRatio440:
return(new Size(width, (height + 1) / 2));
case YCbCrSubsampleRatio.YCbCrSubsampleRatio411:
return(new Size((width + 3) / 4, height));
case YCbCrSubsampleRatio.YCbCrSubsampleRatio410:
return(new Size((width + 3) / 4, (height + 1) / 2));
default:
// Default to 4:4:4 subsampling.
return(new Size(width, height));
}
}
/// <summary>
/// gets the size of the cb cr.
/// </summary>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <param name="ratio">The ratio.</param>
/// <param name="cw">The cw.</param>
/// <param name="ch">The ch.</param>
private static void yCbCrSize(int width, int height, YCbCrSubsampleRatio ratio, out int cw, out int ch)
{
switch (ratio)
{
case YCbCrSubsampleRatio.YCbCrSubsampleRatio422:
cw = (width + 1) / 2;
ch = height;
break;
case YCbCrSubsampleRatio.YCbCrSubsampleRatio420:
cw = (width + 1) / 2;
ch = (height + 1) / 2;
break;
case YCbCrSubsampleRatio.YCbCrSubsampleRatio440:
cw = width;
ch = (height + 1) / 2;
break;
case YCbCrSubsampleRatio.YCbCrSubsampleRatio411:
cw = (width + 3) / 4;
ch = height;
break;
case YCbCrSubsampleRatio.YCbCrSubsampleRatio410:
cw = (width + 3) / 4;
ch = (height + 1) / 2;
break;
default:
cw = width;
ch = height;
break;
}
}
public static @string String(this YCbCrSubsampleRatio s)
{
if (s == YCbCrSubsampleRatio444)
{
return("YCbCrSubsampleRatio444");
}
else if (s == YCbCrSubsampleRatio422)
{
return("YCbCrSubsampleRatio422");
}
else if (s == YCbCrSubsampleRatio420)
{
return("YCbCrSubsampleRatio420");
}
else if (s == YCbCrSubsampleRatio440)
{
return("YCbCrSubsampleRatio440");
}
else if (s == YCbCrSubsampleRatio411)
{
return("YCbCrSubsampleRatio411");
}
else if (s == YCbCrSubsampleRatio410)
{
return("YCbCrSubsampleRatio410");
}
return("YCbCrSubsampleRatioUnknown");
}
#pragma warning restore SA1401
/// <summary>
/// Initializes a new instance of the <see cref="YCbCrImage" /> class.
/// </summary>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <param name="ratio">The ratio.</param>
public YCbCrImage(int width, int height, YCbCrSubsampleRatio ratio)
{
Size cSize = CalculateChrominanceSize(width, height, ratio);
this.Ratio = ratio;
this.YStride = width;
this.CStride = cSize.Width;
this.YChannel = JpegPixelArea.CreatePooled(width, height);
this.CbChannel = JpegPixelArea.CreatePooled(cSize.Width, cSize.Height);
this.CrChannel = JpegPixelArea.CreatePooled(cSize.Width, cSize.Height);
}
#pragma warning restore SA1401
/// <summary>
/// Initializes a new instance of the <see cref="YCbCrImage" /> class.
/// </summary>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <param name="ratio">The ratio.</param>
public YCbCrImage(int width, int height, YCbCrSubsampleRatio ratio)
{
Size cSize = CalculateChrominanceSize(width, height, ratio);
this.Ratio = ratio;
this.YStride = width;
this.CStride = cSize.Width;
this.YChannel = Buffer2D <byte> .CreateClean(width, height);
this.CbChannel = Buffer2D <byte> .CreateClean(cSize.Width, cSize.Height);
this.CrChannel = Buffer2D <byte> .CreateClean(cSize.Width, cSize.Height);
}
/// <summary>
/// Initializes a new instance of the <see cref="YcbcrImg"/> class.
/// </summary>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <param name="ratio">The ratio.</param>
public YcbcrImg(int width, int height, YCbCrSubsampleRatio ratio)
{
int cw, ch;
yCbCrSize(width, height, ratio, out cw, out ch);
YPixels = new byte[width * height];
CBPixels = new byte[cw * ch];
CRPixels = new byte[cw * ch];
Ratio = ratio;
YStride = width;
CStride = cw;
X = 0;
Y = 0;
Width = width;
Height = height;
}
/// <summary>
/// Initializes a new instance of the <see cref="YCbCrImage"/> class.
/// </summary>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <param name="ratio">The ratio.</param>
public YCbCrImage(int width, int height, YCbCrSubsampleRatio ratio)
{
int cw, ch;
YCbCrSize(width, height, ratio, out cw, out ch);
this.YChannel = new byte[width * height];
this.CbChannel = new byte[cw * ch];
this.CrChannel = new byte[cw * ch];
this.Ratio = ratio;
this.YStride = width;
this.CStride = cw;
this.X = 0;
this.Y = 0;
this.Width = width;
this.Height = height;
}
/// <summary>
/// Returns the height and width of the chroma components
/// </summary>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <param name="ratio">The subsampling ratio.</param>
/// <param name="chromaWidth">The chroma width.</param>
/// <param name="chromaHeight">The chroma height.</param>
private static void YCbCrSize(int width, int height, YCbCrSubsampleRatio ratio, out int chromaWidth, out int chromaHeight)
{
switch (ratio)
{
case YCbCrSubsampleRatio.YCbCrSubsampleRatio422:
chromaWidth = (width + 1) / 2;
chromaHeight = height;
break;
case YCbCrSubsampleRatio.YCbCrSubsampleRatio420:
chromaWidth = (width + 1) / 2;
chromaHeight = (height + 1) / 2;
break;
case YCbCrSubsampleRatio.YCbCrSubsampleRatio440:
chromaWidth = width;
chromaHeight = (height + 1) / 2;
break;
case YCbCrSubsampleRatio.YCbCrSubsampleRatio411:
chromaWidth = (width + 3) / 4;
chromaHeight = height;
break;
case YCbCrSubsampleRatio.YCbCrSubsampleRatio410:
chromaWidth = (width + 3) / 4;
chromaHeight = (height + 1) / 2;
break;
default:
// Default to 4:4:4 subsampling.
chromaWidth = width;
chromaHeight = height;
break;
}
}
private static void yCbCrSize(int w, int h, YCbCrSubsampleRatio ratio, out int cw, out int ch)
{
switch (ratio){
case YCbCrSubsampleRatio.YCbCrSubsampleRatio422:
cw = (w + 1)/2;
ch = h;
break;
case YCbCrSubsampleRatio.YCbCrSubsampleRatio420:
cw = (w + 1)/2;
ch = (h + 1)/2;
break;
case YCbCrSubsampleRatio.YCbCrSubsampleRatio440:
cw = w;
ch = (h + 1)/2;
break;
case YCbCrSubsampleRatio.YCbCrSubsampleRatio411:
cw = (w + 3)/4;
ch = h;
break;
case YCbCrSubsampleRatio.YCbCrSubsampleRatio410:
cw = (w + 3)/4;
ch = (h + 1)/2;
break;
default:
// Default to 4:4:4 subsampling.
cw = w;
ch = h;
break;
}
}
public YCbCrImage(int w, int h, YCbCrSubsampleRatio ratio)
{
int cw, ch;
yCbCrSize(w, h, ratio, out cw, out ch);
pix_y = new byte[w*h];
pix_cb = new byte[cw*ch];
pix_cr = new byte[cw*ch];
this.ratio = ratio;
y_stride = w;
c_stride = cw;
x = 0;
y = 0;
this.w = w;
this.h = h;
}
public YCbCr(slice <byte> Y = default, slice <byte> Cb = default, slice <byte> Cr = default, long YStride = default, long CStride = default, YCbCrSubsampleRatio SubsampleRatio = default, Rectangle Rect = default)
{
this.Y = Y;
this.Cb = Cb;
this.Cr = Cr;
this.YStride = YStride;
this.CStride = CStride;
this.SubsampleRatio = SubsampleRatio;
this.Rect = Rect;
}
